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| R14, R15, R18 | 3 | 22k | Resistor | | R9, R11, R13 | 3 | 100R | Resistor | | S1 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x4 | | U2 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x10 Pin header, 2.54 mm, 1x2 (see [build notes](build.md | | | | | | | | | | | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35

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